diff --git a/lychee.toml b/lychee.toml
index 38fc3f9..52b059a 100644
--- a/lychee.toml
+++ b/lychee.toml
@@ -41,6 +41,9 @@ exclude = [
     "inkscape\\.org",
     "domena\\.cz",
 
+    # Deep links into the Slack app, always 403 or redirected to sign-in for anonymous requests
+    "pyvec\\.slack\\.com",
+
     # Website implements the fragments wrong
     "cz\\.pycon\\.org/2016/speakers/talks/#",
     "www\\.zakonyprolidi\\.cz"